Auxiliary holddown for machine for operating on shoe parts



Jan. 1, 1963 R. c. QUARMBY 3,070,820

AUXILIARY HOLDDOWN FOR MACHINE FOR OPERATING ON SHOE PARTS Filed Dec. 1,1961 5 Sheets-Sheet 1 Inventor Faberz C Quarmby v M Jan. 1, 1963 R. c.QUARMBY 3,070,320

AUXILIARY HOLDDOWN FOR MACHINE FOR OPERATING ON SHOE PARTS Filed Dec. 1,1961 5 Sheets-Sheet 2 Jan. 1, 1963 R. c. QUARMBY 3,070,820

AUXILIARY HOLDDOWN FOR MACHINE FOR OPERATING ON SHOE PARTS Filed Dec. 1,1961 5 Sheets-Sheet 3 Jan. I, 1963 R. c. QUARMBY 3,070,820

AUXILIARY HOLDDOWN FOR MACHINE FOR OPERATING ON SHOE PARTS Filed Dec. 1,1961 5 Sheets-Sheet 4 fl m (I; r, L I /f /A x W E PARTS Jan. 1, 1963 R.c. QUARMBY AUXILIARY HOLDDOWN FOR MACHINE FOR OPERATING ON SHO 5Sheets-Sheet 5 Filed Dec. 1, 1961 I I A This invention relates toimprovements in a shoe machine of the type disclosed in United StatesLetters Patent No. 2,958,879, granted November 8, 1960, on anapplication filed in the names of C. H. James and R. C. Quarmby, and anapplication for Uni-ted States Letters Patent Serial No. 66,560, filedNovember 1, 1960, in my name.

The James et a1. patent discloses a rotary cutter and a movable worksupport having a matrix located therein which facilitates the properpositioning of a shoe part for presentation to the cutter, said cutterhaving a presser member integral therewith adapted to retain the shoepart firmly positioned within the matrix while the cutter is operatingon the shoe part. The above-mentioned application provides means wherebythe feeding movement of the said work support is varied during theoperation cycle and the cutter is rendered movable between an operativeand an inoperative position in such manner that the shoe part is exposedto the cutter only during the operation portion of the work cycle.

As a result of attempted utilization of the machine in the formdelineated above, it has been found that as the support meansprogressively introduces the shoe part to the cutterhead and the pressermeans attached thereto, there is a tendency for the trailing end of theshoe part which is not subject to the action or" the prcsser means tobuckle or distort relative to the matrix, thereby subjecting the trailinend of the shoe part to the possibility of damage by the cutter.

An object of the present invention is toprovide a holddown means whichensures the proper alignment and positioning of the shoe part within thematrix prior to and during the initial stages of the cutting operation.The purpose of the novel holddown member is to retain the trailing endof the shoe part firmly within said matrix until it is engaged by thepressing means attached to the cutterhead.

To this end and in accordance with a feature of the invention, there isprovided a holddown member having mounting means and drive means whichfacilitate lateral movement from an inoperative position to and from aposition above the shoe part and vertical or heightwise movement intoand out of engagement with the shoe part, thereby permitting theholddown member to retain the shoe part within the matrix .duringoperation of the cutter.

The above and other features of the invention, including novel detailsof construction and combinations of parts, will now be described in thefollowing specification and will be pointed out in the appended claims.

In the drawings,

FIG. 1 is a front elevation of an illustrative machine having thepresent invention provided thereon;

FIG. 2 is a plan view of a portion of the illustrative machine showingthe holddown member in detail;

FIG. 3 is a right-hand side elevation of the mechanism shown in FIG. 2;

FIG. 4 is a plan view of the work support and bed along which thesupport is movable to present a work piece thereon to the cutterhead;

FIG. 5 is a sectional side elevation of a portion of the drive controlmeans as viewed from the right; and

FIGS. 69, inclusive, illustrate parts of the fluid sys- Edi/h8 6Patented Jan. 1, 1963 tem of the machine, FIG. 6 being a sectional frontelevation of a valve and mechanism for lowering the cutterhead, FIG. 7being a sectional front elevation of a valve and mechanism forcontrolling the movement of the work support, FIG. 8 being a frontelevation of the structure of FIGS. 6 and 7, and FIG. 9 being adiagrammatical showing of the entire fluid system.

The illustrated machine has a base it (FIG. 1) upon which are mountedfour posts 12 for supporting a bed 14 which extends laterally of themachine. The bed has ways 16 thereon along which slides a work support18 carrying, in a recess in its upper surface, a matrix 19 (FIGS. 1, 2,and 3). The work support 18 is driven through a feeding movement to theleft, from its position as illustrated in FIG. 1, and an opposite returnmovement by a fluid motor comprising a cylinder 26 (FIGS. 1, 2, 3, 4,and 9) Which is fixed at each end thereof upon the bed 14 and a piston22 (FIGS. 4 and 9). A holddown member 32 located on a holddown means 30(FIGS. 1, 2, and 3) is driven laterally from an inoperative positionthrough a horizontal are described by an arm 34- and a leaf spring 36 toa position above the matrix 19, said matrix having simultaneously movedfrom the position illustrated in FIG. 1 to a position immediatelyadjacent the area of actual cutter operation by means of the abovedescribed fluid motor. The drive mechanism imparting said lateralmovement to the holddown member 32 consists of a fluid motor having adouble acting hydraulic piston 46 (FIGS. 2 and 9) movable in a cylinder41, there being connections to be described between the piston and theholddown member 32 and hydraulic circuitry which facilitates theconcurrent movement of the support 18 and the holddown member 32. Thereturn stroke of the holddown member 32 also occurs simultaneously withthe return of the support member from a position adjacent to saidoperating area. The interrelation is described in detail hereinafter.

A cutterhead 59 (FIGS. 1 and 2) is mounted for vertical movement betweenan operative position, wherein a cutter 51 is at a level immediatelyabove the matrix 19, and a retracted position at a distance above itsoperative position. For this purpose, the cutterhead is mounted upon theupper end of a hollow column 52 (FIG. 1), the lower portion of which isclamped in a post 53 mounted to slide vertically in a cylinder 54 whichis fixed upon the base it). The post 53 is operated to lower and raisethe cutterhead Si by a fluid motor which comprises a cylinder 55 (FIGS.1 and 9) integral with the cylinder 54, and a piston 56 which runs inthe cylinder 55. The details of the movement of the cutterhead and themeans for moving it are as delineated in the above-mentionedapplication, Serial No. 66,560. The holddown member 32 is movablevertically in synchronism with the movement of said cutterhead by mean-sto be hereinafter described.

The holddown means 3%) (FIGS. 1, 2, and 3) includes two double actingpistons which cooperate to impart both vertical and lateral movements tothe holddown member or plate 32 which is placed in contact with a shoepart and removed therefrom by the operation of said pistons. The plate32 is carried on the leaf spring 35 which is afixed to the arm 34 lyingin a plane generally parallel to that of the plate which has aconfiguration corresponding generally to the portion of the shoe part tobe held thereby. The arm 34 is secured to a vertically extending shaft60 (FIGS. 2, 3, and 9) to which is secured a piston 61 (FIGS. 3 and 9)slidable within a vertically disposed cylinder 62 concentric with saidshaft 60. The ends of the cylinder are closed by caps 63 and 64 havingaligned apertures therein to permit the passage of the upper and lowerportions 65, 66, respectively, of the shaft 69, the lower end havingsecured thereto a gear 7 which, by its engagement with the cap 64,limits the upward movement of the shaft 60 and thus determines theupper, inoperative position of the holddown member. The shaft, with theparts carried by it, is counterbalanced by a spring 67 which surroundsthe shaft 60 within the cylinder 62 and is interposed between the piston61 and the lower end cap 64. Thus, the spring retains the plate 32 inits vertically inoperative position whenever the machine is at rest andthe hydraulic fluid is not under pressure. The cylinder has connections68 and 69 in the upper and lower portions thereof, which permit theintroduction of fluid into the cylinder for the purpose of controllingthe movement of the piston 61 and, consequently, the holddown plate 32itself. Application of pressure fluid to the upper surface of the piston61 by means of the connection 68 forces the piston and the plate downinto operative position against the force of the spring 67.

The second double acting hydraulic piston 49 (FIGS. 2 and 9) is slidablyhoused within a hydraulic cylinder 41 which is disposed transversely tothe cylinder 62 and lies in a contiguous position relative to the gear70 mounted on the shaft 60, the cylinder having a laterally extendingsurface cavity in the area of continguity which exposes a longitudinalportion of said piston 40 and facilitates contact and cooperationbetween the exposed portion of said piston 40 and said gear 70. Thepiston 40 has rack teeth 42 formed thereon which function in cooperationwith the teeth of the gear 70. The gear 70 is of sufiicient length toensure continued engagement with the piston 40 during the vertical cycleof movement imposed upon the gear 70 by the action of the piston 61. Thehydraulic cylinder 41 is closed at its ends by end caps 43 and 44. Thecylinder has connections 45 and 46 located at apposite ends of thecylinder which permit fluid to be supplied to the respective ends ofsaid cylinder in order to control the movement of the piston. Theapplication of hydraulic pressure to either end of said cylinder resultsin longitudinal movement of the piston 40 which is translated into arotational movement imparted to the gear 70 and, consequently, to theshaft 60, arm 34 and plate 32, thereby permitting the plate 32 to swinglaterally between an operative and an inoperative position, thedirection of movement being determined by the direction in which thepiston is driven. The amount of longitudinal movement of the piston 40is regulated by the adjustment of stop screws 47 and 48; thus,determining the operative lateral position and out-of-the-way orinoperative lateral pisition. The holddown means is secured to themachine frame by a bracket 49.

The above-mentioned fluid motors for moving the work support 18,cutterhead 50 and the holddown means 30 are parts of a fluid system forwhich pressure fluid is supplied by a pump P (FIG. 1), driven by a motorM. The output of the pump is delivered via a pressure regulator 78 and afilter 80 through a duct 82 (FIG. 9) to a four way, self-centering valve84. This valve is normally in its centered position wherein fluid drawnby the pump from a reservoir R is returned thereto.

With the work support 18 in its loading position at the right-hand endof the bed 14 (FIG. 1), the holddown means in its out-of-the-way orinoperative position (FIG. 2, broken lines) and the cutterhead 50 raisedin to its normal retracted position, a cycle of operation of the machineis initiated by closing a switch 86 which energizes a solenoid S1, atthe left-hand end of the valve 84, to move the valve to the positionillustrated in FIG. 9, wherein pressure fluid is delivered to theright-hand end of cylinders 20 and 41 through the piping 88 and 46 tocause a feed movement of the work support 18 to the lift and concurrentlateral movement of the holddown plate 32 through a horizontal are suchthat the holddown plate will be immediately above the matrix in thesupport member on completion of the initial phase of the movement cycle.Exhaust fluid is ejected from the left-hand end of cylinders 20 and 41through pipes 99 and 45 to a valve body 92 (FIG. 7) having therein aduct 94 which leads to one side of a normally open choke valve 96 and toa check valve 98. The discharge fluid from the choke valve 96 is carriedto the reservoir R via a bore 190 in the valve body, radial openings ina check valve 192, another check valve 104, a duct 106 in the valve bodyand piping 108 which leads to the valve 84.

The spindle of the choke valve 96 is rotatably mounted in the valve body92 and is provided with a narrow segmental slot 110 which isperpendicular to the axis of the choke valve and provides a passage forthe flow of fluid from the duct 94 into the bore 100. Upon the forwardend of the choke valve there is fixed an arm 112 (FIG. 8) carrying ahook between which and another hook at the upper end of a bar 114 fixedupon the body 92 there is stretched a spring 116. This spring biases thechoke valve 96 toward its fully open position, as illustrated in FIG. 8,which is determined by the engagement of the arm 112 with a stop screw118 which is threaded into the body 92. With the fluid passing freelythrough the choke valve which is in its open position, the work support18 and the hold down member 32 advance toward the cutter as describedhereinabove until the matrix reaches a position immediately adjacent thearea of cutter operaton such that a presser means attached to thecutterhead will contact the forwardmost portion of the shoe part, whensaid cutterhead is subsequently placed in operative location. At thistime, the movement of the work support 18 and the lateral movement ofthe holddown member 32 is gradually reduced and then interrupted becauseof the closure of the valve 96, as will next be described.

Upon the forward side of the work support 18 (FIGS. 1 and 5) there ismounted a long slotted cam plate 120 having at its left-hand end asloping shoulder 122 the lower end of which is disposed below a levelcam surface 124 on the cam plate. Soon after the initial movements ofthe work support and holddown member 32 from the inoperative positionsbegin, the shoulder 122 on the cam plate 120 engages a roll on an arm132 which is fixed upon the forward end of a shaft 134. This shaft ismounted for rotative and axial movements in the bed 14 (FIG. 5) and isbiased rearwardly by a spring 136 which is compressed between a bracket135, which supports the shaft, and a shoulder on the shaft. Upon therear end of the shaft 134 there is fixed an arm 138 to the end of whichthere is pivoted a link 140 (FIGS. 1 and 8), the lower end of which hasa block 141 having an L-shaped slot 142 therein. This slot receives apin 144 which is carried by a bifurcated arm 146 fixed upon the rear endof the choke valve 96; and a spring 147, stretched between the link 140and a bracket 75, causes the pin 144 normally to be seated in theright-hand end of the slot 142.

During the initial feeding movement of the work support and thesimultaneous lateral movement of the holddown member, the arm 132 isheld in an outer position, wherein the roll 130 is in alignment with thecam plate 120, by a bar 148 (FIG. 5), which is fixed to the work support18 and is adapted to engage the rearward side of a lug 150 on the arm132. It will now be evident that when the shoulder 122 on the cam plate120 is presented to the roll 130, the arms 132 and 138 will be swungcounterclockwise, the link 140 will be lifted and the choke valve 96will be closed, this event occurring when the lower end of the shoulder122 lies directly over the roll 130. At this time also, the shoe partwithin the matrix will have been moved to a position immediatelyadjacent the area of cutter operation such that it will be subject tothe presser member attached to the cutterhead when said cutterhead issubsequently lowered into position. The piston 40 will have moved theplate 32 to a position above the matrix and the piston will havecontacted the stop screw 47.

Just before the choke valve 96 is closed, a valve 152 (FIGS. 1, 6, 8,and 9) to which fluid is supplied by the piping 88 is opened to deliverfluid through the piping 154 and 68 to the upper end of the cylinders 55and 62, whereby the cutter head and the holddown'plate 32 areconcurrently lowered into operative positions. The valve 152 has a bore156 containing a piston 158 which is biased to the left by a spring 160but is normally held in its closed position by a latch 162. The latch isfixed upon a shaft 164 (FIGS. 1, 6 and 8) upon the forward end of whichthere is fixed an arm 166; and a spring 168, stretched between hooks onthis arm and the base 10 yieldingly holds the latch in a recess 170 inthe piston. A pin 172, carried by the arm 166, is received in a slot 174formed in the lower end of a link 176, the upper end of which is pivotedto the above mentioned arm 138. It will now be evident that, because ofthe slot 174 in the link 176, the latch 162 will not be operated torelease the piston 158 and open the valve 152 until just before thelower end of the shoulder 122 on the cam plate 120 is presented to theroll 130. Displacement of the piston 158 to the left causes a port 178(FIG. 6) in the valve 152 to be opened whereby fluid is permitted topass through the piping 154 and 68 (FIG. 9) into the upper end of thecylinders 55 and 62. Thus, lowering movement of the cutterhead 50 intoits operative position is begin and such movement continues until it isarrested by stop means provided on a bearing member 1'79 fixed to thebed 14, as described in the above referenced application Serial No.66,560. v

The terminal movement of the cutterhead into its operative position isutilized to reset the choke valve 96 to facilitate the subsequentmovement of the support 18. Before the cutterhead reaches its operativeposition, a finger 189 (FIG. 1) on the post 53 swings an arm of a bellcrank 182 (FIGS. 1 and 7) counterclockwise so as to cause a screw 184,threaded in the lower end of the bell crank, to contact the block 141and thereby shift the link 146 to the right, whereby the pin 14-4 ispermitted to fall into the lower portion of the slot 142 under theimpulse of the spring 116. Thus, the choke valve is automatically openedand movement introduced to the support 18.

The operation portion of cycle is then completed in accordance with theabove-referenced application Serial No. 66,560. Upon completion of theoperation on the shoe part and the feeding movement to the left, amicroswitch 208 (FiG. l) which is fixed upon the bed 14 is actuated bymeans located on the support 18 and causes a solenoid S2 at theright-hand end of the valve 84 to be energized. The valve is thusshifted to the left to a position wherein fiuid pressure is directed tothe piping 1th; and 69 (FIG. 9) and discharge of fiuid from the piping88 and 46 in to the reservoir is permitted.

The first response to this shift of the valve 84 is the beginning of arising movement of the cutterhead 5t? and the holddown plate 32 becausefluid pressure is immediately delivered through the piping 168 and 69 tothe bottom of cylinders 55 and 62.. Fluid is discharged from the upperend of the cylinders 55 and 62 through piping 63 and 15:1 and a duct 210which leads, around the valve 152, to the piping 88. A check valve 212in the duct 21 permits the free flow of fluid in the directionindicated, but prevents the delivery of fluid pressure through the ducttoward the cylinders 55 and 62. Upon arrival of the cutterhead to itsnormal retracted position and in response to an increase of pressure inthe fluid system caused by the stopping of the pistons 56 and 61, thevalve 102 (FIGS. 7 and 9) is opened. The delayed opening of the valve162 is accomplished by providing a spring in said valve which has aspring rate of sufficicnt magnitude to insure that the motion of thepistons 56 and 61 is arrested prior to the opening of the valve 192.Fluid discharged from the valve 102 is delivered, via the bore 100, thecheck valve 98, the bore 94, and the piping 9t)- and 45, to theleft-hand end of the cylinders and 4-1, whereby a rapid return stroke isimparted to the work support 18 and the holddown member 32 because thechoke valve 6 is now by-passed by the fluid connections including thecheck valve 98 which permits the free flow of fluid to the saidcylinders 20 and 41. The cam surfaces attached to the work support willbe presented to the roll on the arm 132 during the return stroke in thereverse order that presentation during the work occurred. Thus, the arms132 and 138 are permitted to swing clockwise into their originalpositions, whereby the choke valve 96 is returned to its fully openposition and the latch 162 is released and biased against the piston 158in the valve 152. The valve 152 is now latched in its closed statebecause the piston 158 will have been returned to the closed position byfluid applied to its left-hand end (FIG. 6) through the piping 108 whenthe valve 84 was shifted to the left.

At the end of the return stroke of the work support 13, a cam located onthe work support operates a microswitch and, as a result, the solenoidS2 is deenergized and the valve 84 returns to its centered position.Thus, there is completed a normal cycle of operation of the machine.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,and drive means for imparting to said support a cycle of oppositefeeding and return strokes; a hold-down member adapted to retain theshoe part within the matrix on said support prior to and during thepresentation of the shoe part to the cutter, means mounting saidhold-down member for movement horizontally into and away from a positionabove the shoe part and vertically into and out of engagement with theshoe part, and drive means for moving said hold-down member horizontallyinto and away from said position above the shoe part simultaneously withthe feeding movement of the support.

2. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,said cutter being mounted for movement toward and away from said worksupport, drive means for imparting said movements to the cutter andsupport, and means for controlling said movements such that said supportand cutter do not move concurrently: a hold-down member adapted toretain the shoe part within the matrix on said support prior to andduring the presentation of the shoe part to the cutter, means mountingsaid hold-down member for movement vertically into and out of engagementwith the shoe part, and drive means for moving said hold-down memberinto and out of engagement with the shoe part simultaneously w th themovement of the cutter into and out of its operative position.

3. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,said cutter being mounted for movement toward and away from said worksupport, drive means for imparting said movements to the cutter andsupport, and means for controlling said movements such that said supportand cutter do not move concurrently; a hold-down member adapted toretain the shoe part within the matrix on said support prior to andduring the presentation of the shoe part to the cutter, means mountingsaid holddown member for movement horizontally into and away from aposition above the shoe part and vertically into and out of engagementwith the shoe part, and drive means for moving said hold-down membervertically into and out of engagement with the shoe part simultaneouslywith the movement of the cutter into and out of its operative position.

4. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,said cutter being mounted for movement toward and away from said worksupport, drive means for imparting said movements to the cutter andsupport, and means for controlling said movements such that said supportand cutter do not move ocncurrently; a hold-down member adapted toretain the shoe part within the matrix on said support prior to andduring the presentation of the shoe part to the cutter, means mountingsaid hold-down member for movement horizontally into and away from aposition above the shoe part and vertically into and out of engagementwith the shoe part, and drive means for moving said hold-down memberhorizontally into and away from said position and vertically into andout of engagement simultaneously with the movement of the support andcutter, respectively.

5. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,and drive means for imparting to said support a cycle of oppositefeeding and return strokes; a hold-down member adapted to retain theshoe part within the matrix on said support prior to and during thepresentation of the shoe part to the cutter, means mounting saidhold-down member for movement horizontally into and away from a positionabove the shoe part and vertically into and out of engagement with theshoe part, and drive means for moving said hold-down member horizontallyinto and away from a position above the shoe part simultaneously withthe feeding movement of the support, said hold-down drive meanscomprising a shaft to one end of which the hold-down member is afiixed,a double acting piston having rack teeth thereon, a cylinder housingsaid piston having a longitudinally extending surface cavity exposingsaid rack teeth, and a gear carried by said shaft in engagement withsaid rack teeth whereby rectilinear movement of said piston causesrotational movement of said shaft and horizontal movement of saidhold-down member.

6. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,said cut-ter being mounted for movement toward and away from said worksupport, drive means for imparting said movements to the cutter andsupport, and means for controlling said movements such that said supportand cutter do not move concurrently; a hold-down member adapted toretain the shoe part within the matrix on said support prior to andduring the presentation of the shoe part to the cutter, means mountingsaid hold-down member for movement vertically into and out of engagementwith the shoe part, and drive means for moving said hold-down memberinto and out of engagement with the shoe part simultaneously with themovement of the cutter into and out of an operative position, saidhold-down drive means comprising a shaft to one end of which thehold-down member is affixed, a double acting piston connected to saidshaft for imparting axial movement thereto, and a cylinder housing saidpiston.

7. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,said cutter being mounted for movement toward and away from said worksupport, drive means for imparting said movements to the cutter andsupport, and means for controlling said movements such that said supportand cutter do not move concurrently; a hold-down member adapted toretain the shoe part within the matrix on said support prior to andduring the presentation of the shoe part to the cutter, means mountingsaid hold-down member for movement horizontally into and away from aposition above the shoe part and vertically into and out of engagementwith the shoe part, and drive means for moving said hold-down membervertically into and out of engagement with the shoe part simultaneouslywith the movement of the cutter into and out of an operative position,said hold-down drive means comprising a shaft to one end of which theholddown member is afiixed, a double acting piston connected to saidshaft for imparting axial movement thereto, and a cylinder housing saidpiston.

8. In a machine for operating upon shoe parts, said machine having arotary cutter, a work support having a matrix for holding a shoe part tobe operated upon and movable to present the shoe part to said cutter,said cutter being mounted for movement toward and away from said Worksupport, drive means for imparting said movements to the cutter andsupport, and means for controlling said movements such that said supportand cutter do not move concurrently; a holddown member adapted to retainthe shoe part within the matrix on said support prior to and during thepresentation of the shoe part to the cutter, means mounting saidholddown member for movement horizontally into and away from a positionabove the shoe part and vertically into and out of engagement with theshoe part, and drive means for moving said holddown member horizontallyinto and away from said position and vertically into and out ofengagement with the shoe part simultaneously with the movement of thesupport and cutter, respectively, said holddown drive means comprising ashaft to one end of which the holddown member is affixed, a doubleacting piston connected to said shaft for imparting axial movementthereto, a cylinder housing said piston, a second double acting pistonhaving rack teeth thereon, a second cylinder housing said second pistonhaving a longitudinally extending surface cavity exposing said rackteeth, and a gear carried by said shaft in engagement with said rackteeth whereby rectilinear movement of said piston causes rotationalmovement of said shaft and horizontal movement of said holddown member.

9. A machine for operating upon shoe parts, said machine having a matrixto hold a shoe part, a cutter, a movable support adapted to carry thematrix and the shoe part therein into and out of an operative positionrelative to said cutter, said cutter being movable transversely relativeto said support for engagement with the shoe part presented thereby, ahold-down member adapted to retain the shoe part within the matrix priorto and during the presentation of the shoe part to said cutter, saidhold-down member having mounting means which facilitate horizontalmovement from an inoperative position to and from a position above theshoe part and vertical movement into and out of engagement with the shoepart, and drive means for imparting said horizontal movement to theholddown in synchronism with the movement of said support to and from aposition juxtaposed to the area of cutter operation and said verticalmovement to the hold-down member in synchronism with the movement ofsaid cutter into and out of engagement with the shoe part, the saidmovements of the hold-down member occurring in sequence.

References Cited in the file of this patent UNITED STATES PATENTS

1. IN A MACHINE FOR OPERATING UPON SHOE PARTS, SAID MACHINE HAVING AROTARY CUTTER, A WORK SUPPORT HAVING A MATRIX FOR HOLDING A SHOE PART TOBE OPERATED UPON AND MOVABLE TO PRESENT THE SHOE PART TO SAID CUTTER,AND DRIVE MEANS FOR IMPARTING TO SAID SUPPORT A CYCLE OF OPPOSITEFEEDING AND RETURN STROKES; A HOLD-DOWN MEMBER ADAPTED TO RETAIN THESHOE PART WITHIN THE MATRIX ON SAID SUPPORT PRIOR TO AND DURING THEPRESENTATION OF THE SHOE PART TO THE CUTTER, MEANS MOUNTING SAIDHOLD-DOWN MEMBER FOR MOVEMENT HORIZONTALLY INTO AND AWAY FROM A POSITIONABOVE THE SHOE PART AND VERTICALLY INTO AND OUT OF ENGAGEMENT WITH THESHOE PART, AND DRIVE MEANS FOR MOVING SAID HOLD-DOWN MEMBER HORIZONTALLYINTO AND AWAY FROM SAID POSITION ABOVE THE SHOE PART SIMULTANEOUSLY WITHTHE FEEDING MOVEMENT OF THE SUPPORT.